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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e31b142580ab50f811bfee00bbb728c98bdfd53aa12b73a0d1b9ff85eba0bbf' 
  AND token = 'z31956hZMIFMmBLN+7nS5RpCJIJCB5HN7oMh5pUgmXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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