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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16af915603e9631f6a8322479ce93060ecbdea09d934cbafddea4f356170a8d5' 
  AND token = 'a94QT2/Lvw1P6tYXkwWCjcZYqCSIFfETXa6WxveLj/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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