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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79c0c0b26fabead154e3c9e310d75dfc9eb0305667f0d50d04c3eab0485cd0b' 
  AND token = 'Oi/tTz7TVi7YZOwTSkJ6CSvXr0n2ObRYP9kUB6o/r1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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