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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b496b1b8c6642422d67caf74cbecea2d2cee9f7e133ac5d986a9809178446a2' 
  AND token = 'a/J3G97zjX+WCfDQmlQzfD1vi/ZTdK24fcUlD3az7+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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