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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58518fbb6f854db924c384bc1a9933db0ede32c962d88f52264358b226622387' 
  AND token = 'A/BQW24yjM1Ytp16ItSC+SsgK7HM+6y0UqYD39TTyXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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