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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd296a8e6baebf98145fe8c825b44fa1a304c3760cf60f15c9115193dc8ee54b' 
  AND token = 'udwcO+s67HQrqKer+8mzTc7ESG+Gtp7H7HqqAQudbE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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