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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979103915c9ebd365c320ba7265dd484e9583cac1ff0bd4c5587f6698b7cba3c' 
  AND token = 'XLTEaxoGqg3w9NJBt8dblr+td6wwTDOiM4OZIevfYQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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