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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40dd54212a6d1ac6e5d7c120622cbcf60dbd36fb9e1a93b0a36a9b500bed4e78' 
  AND token = 'VvgBBG8Qr4oPN9qEzgnlpywfAej3HyP8ZLw6wkNLEkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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