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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973933b4f2db65921a4bb4f9ee73857e2978a7f22c35f2457b50862d7f3bd363' 
  AND token = 'wOpIpLwaVgQ7mMwJxiuk0QwgtcVwfbb6KWgl+kLi6Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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