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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073d05634abf67f7ec25baca7033faa1317d008a5c913f75af9d64843043fc82' 
  AND token = 'TJcrsHBMz3Xv7KXrQcPat7Z/BE+YM+kCOunO6O+bxRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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