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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb17003c5b283be8bb860255157e336336f023de38c1d8e2ca27996c82bac2f' 
  AND token = '5UJzra3c2Ug0QPRGHLE0jTrv19UMOfS+Bx8Dp/raBzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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