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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b235cc8f767401c7372d8136a828b15b70b8be9b9735533fbdb89c86e56d503' 
  AND token = 'N7t6CWfaZT+864TEs9EFqyerKtfwoh6kb0aZQaVoMeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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