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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459a964ecf35bd7e1aece563de87c5cfd3cd5b1bee73a427cf0a925d77cf9151' 
  AND token = 'Xf4LAtX6bqeloqH8WtTstBqTMBfl5wD/1qVeAKo0gVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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