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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3edff022d5ddc92b27eda38ca67dc6e22b5754bdf4bbe015a4f6c87ff3f190c0' 
  AND token = 'WKfpytepmzL60e/U44AO7K8kwyPI7GB0znvXNWozkfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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