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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409d865073cacf29633d5c8ce66639541acb761c9f21b6cd065a81a628e2a06f' 
  AND token = 'xnbOKKczjbWXg9tQ3TzIrKLa8tSOkDT21wv5L3Tny/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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