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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bce19778bc779c065d67d648dc46f29ca9a40666d79bab276e48a750a64af84' 
  AND token = 'aPrK9iWpViN4cDQhR2kQjZY9RhTjdqKWKF6wAbjh3mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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