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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc94dc5b68275a0f657dd60310957d5a2453caa4c947e7b40c8e339409b9ceb9' 
  AND token = 'QLGwYex1C3UgGveHCeu9RIvz9/451l5ZTYc/2sugtRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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