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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb11b757fb0cb20613921c405cbf3071a66d0c60546b2f6cc49d8a5036328be' 
  AND token = 'kxtrJcwkCt4+9wnCf+w6JPlsUQl0srpzCtck68H1UlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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