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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f17a36ee5ba9ab4ec85f64e77e789759b2889ab61301133bbd1bb65ab07201' 
  AND token = 'S8SNqp/ZzmnBTcRs9w2t5p9yqAk8C8QUDw6QuXbnfNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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