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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061ba7794a53ffd57e1986717d760a06c5497b00b76cc48b35262ff2931a6654' 
  AND token = 'K/eD5Fc/f3HGi1Hw74mzIsR9Vv/W8xsPHmUQpH3lyA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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