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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0596de3e3cff04cda22d886d7fdfe829821c7d19a265235a3b8e0325668acb' 
  AND token = 'uaYY5EOEU0AqtvhSZl/4dmdkBo39rXtrhs9v8PJxS1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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