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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de24ae11e791bdc1d37c1f8caa82575190974f7ea1b5ed724881dd3126e2c52' 
  AND token = 'S9OVLwYtsa9UT7TKXQLgTib6NZmcWDyPTd2hQyP7aYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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