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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cb34e6b40249326e7ce5e92e43470639293e6d2bdee571262ba60144102fd1' 
  AND token = 'ENug4rUq9gHqnW6pRKdToXxFlf+eVOSIygu6EZLAV+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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