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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530b163f108409dc65ee49d4cdfcd5a9bc1f4126120ea87f6b3a7d8377382a4f' 
  AND token = 'Mwt6fGper29Gv4fg+mVylh3mCJMyTip5h48btHVlkHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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