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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff154d53c28ac3285a10e0177e93509380bb453db69128d8e65ec9f855db8ce' 
  AND token = 'gl0liLu3udO613eYHqUqQdvU1bv+FnUK66QO8HmMfDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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