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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cfc46226c52b127823cb349c2407f3a0d5c80e221a7e7d5052b61168262e0a' 
  AND token = 'kCvBzSbdEyyI0w/mcWIIi09ol1yl4VxkIefo2GBbry0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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