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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7408316a0760db946c9013dd6dd1c8fd38a8c97ee58053b335f928744aaef1' 
  AND token = 'Wadkua7rTIhppf/ifI3R32II29p+sCBoAcny6wOA7j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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