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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cd4faa446383a07c401c083905f121ca858d39b12a6302c9fd3867d4385d58' 
  AND token = 'xN/0ixcTIxDlZMvNMkJqaYxN3ZaPjnGKU0rdy267qRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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