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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc9ae7fb7d53df5769871040d4b9eda98a4de7dcfa5a575aa4608bdd4f7aeac' 
  AND token = 'gwlxPBfPuwvJ1yiiVDWoGKOF7KfM9xUwvmEaM1HIF8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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