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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb45fbcd3c8d1ea305d4ab3e0c709255b8032f99c530c86f9e348ace8bf6ea3' 
  AND token = '8kc+jnwSiUnTzrxwGG9K7/fu1tPxLv0qP5alH8hs0kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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