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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868ee62299c713075022d34b0c06ddd027a252b5a5b8248c60c8b3ea1319543d' 
  AND token = 'c4bYImagSO7ozzogdg+XMbGTrgh2JrC6+8RgmqtxRng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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