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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186dc8ddc021149883bdbbeb024c93f4c016af11a18ac9dc172f9d69dd957ef1' 
  AND token = 'Utcvxf6ePT2AxWehPwKpa/wDQeW/kdW/2q94Avo8pXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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