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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d62ae9c1cbe7ddba96aed136a9c84303611442062f5c93717df5895754fb83' 
  AND token = '41cI0vzy7CQbgwft03kaAgBGJo0ozoPOzuejfLU/sZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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