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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5a003e805eac5c9b885b838ed376eaf3413961590c22f049b64784cb5cb1f5' 
  AND token = '43YSJpRBj5GnM18VwyFcOv0q/nNOCiOd0kr1/I/MXBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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