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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204f4b6bd5b3f6d3a30cade7f7b742d77adba0d17ebf36efd99db8f680908af9' 
  AND token = 'rbCif9tizf371AszJ+0rGQu0qN7vW8bbstfgFw5zL7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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