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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335e8c52b4791cf03579f78e25d6102a000943950d048c67e154ffe0067af2f7' 
  AND token = 't+3ch9Y7vwek8KFKdbUwNc/D966tvfVTk7rIdKszXD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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