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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17019afc8f7a47a1be410bea92a89b85b3279293418bd0a8a91c411b5b6d7961' 
  AND token = 'atQoVLC6e/AqZEaZw5IL42hig2lRBW86eVTP+4HSNVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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