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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3880de60f29fe9537a429b35076bbb0fc8f688cc8b78c0ecac5fb8f3e85e7d' 
  AND token = 'Go/v1tbhqIvml5jssE7iK+F6jsRiqVLYIOeTG1pYyDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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