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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ec994ee18c1f137110cc8b815d86678ae9e950dbf3d055ee020c077cf585be' 
  AND token = 'xa0MeNwTc5C76fyu1dFL7B94pIwjnOX8q1IH5NpxUtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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