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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1347f30799e73725c678f68d0c1e9d7728e18601974dccfda88e57ef9a1974' 
  AND token = 'FG6xoQkD98/jnXPFr4bPIvyOYrYuH5yTIOLaS3ruREI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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