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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2732d4f2282fe6607ed7692a29485b63151d49e5366777fde6a30d9334ac5d2' 
  AND token = 'MUv/JcavA1pst1jB9Fgv//vgsVB5xPXw1YdH6RHEbtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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