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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c989a244dcd5ea32be77ea5c1783aa988c76283a9c14cd80e6c35b5a305f9b44' 
  AND token = 'urP0D03TiK7aJTJwmDoq+bvRdcCzcijCM2TmyqMjg28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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