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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc350bd92222a0145114cb320f664215a9fb691326da0c0eceb7b23cdb7cad4' 
  AND token = 'dsKsvwdKc8xWb0kzGu8BGMQaQF8e/itgti9yOUrfa5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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