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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175d4dfdf903c6974f41db29ff5ae3d5c459f09597a2bc56f7eec9b96569d8ba' 
  AND token = 'Oi7guyAkmr5yHUZzdJ+R+NhsO74dQvgWNHdUIJeh0hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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