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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e5f7063f1489086a62e40f4fa9943ce9a5a053a3cecc5e5b6acf18b2148a8f' 
  AND token = 'cDcy+fwScQ3RhaJg9XTpCejDS+ZbJlXciMih/iaRb9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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