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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f755a618ec529bff3162f8914dc996643408f6ce9cf0964ec48d7d4e24ee2c1e' 
  AND token = 'JH8V53EHGOm6NPVstcIRJ4kd8rmEvO1MF5hlcoJQa0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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