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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e493fd44a96b82ebc1d52076e50e7d53fc4f53e5d10de3f8ddd977cb24140f8' 
  AND token = 'MAuI748wziOwKdwjeGf5Aj5OQNv9fHMMv0gyqvzzQrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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