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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1197dceaa200ea20b88f1f2580add11341f01e691a830a46af29ef3ac7ce3e1' 
  AND token = 'vaSc7c39e+/JLyka16jwwLTal0i2JSJtshowtteiEDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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