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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc228045197f0c59a984d778da42ebb47b4af92e6e3e357ecb23fc36ac4e939a' 
  AND token = '0vqfEiPc5QaU/UGk+GTUProFKHfDL1g1uShg2lvcO7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}