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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da233fa35cd7923dc22d40a7ddeba8c35f728fa9c67d177f1e4e87224d6d9f44' 
  AND token = 'w1cKK5elTYRfxD8qvXOii4MVtPmuMF//psdTwaWW+G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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