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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257173c09181b444e64633d8ce957eec070154bf20aee8ff3c6f5ae7c13aee8c' 
  AND token = 'YgiP+VQeeYUiP0aAcJXRqc+ZtpxVJ6TuAYoR6c0u3g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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