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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c94b2c12ba0e6236c5c7f9bb977dce4c4def6ec4d698410c6da48cd5be39c3' 
  AND token = '74IkpCr+dmc9o/1rxPWkc8BMjPUfZMD+tHfu/OH2bLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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