SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1610de2c55d79b80fb406cba650c4c948226ec89ff5a8b48058f7884d0f5a2d3' 
  AND token = 'm/OijsJY0Cb1UQ3QsFHO59qw/ELAh0g7zqfZpJy2Ba0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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