SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07cdf4507a0db1c72f3a248b2c18e5eb955789ac311c36eddc24926509761f6a' 
  AND token = 'Xbyl0Li5UduRq0sAGmVoZeyVWjh0HqgtkrY+JZgRlZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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