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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a14599abadce5bee0bb4608957e9563a15a137dbe70e7854a554125a219fdd' 
  AND token = 'Rl9Nbd+yrtYL6t6I5icn2p1eytBR+wllp2RlgNXO71g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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