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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2ff11b9dfcd1e78de4f270dd615bd94aa1c14d82288bcef7de0520356d4f75' 
  AND token = 'qUiYJBtxWvfL3SM0c/GSYKL/n2GvA2wh2lGHSe8J4CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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