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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33672502fef28e1d6bd716e6330d41a80e6a6d91bef51a248b1c2d3641251ae2' 
  AND token = 'nPXi312YTV0paW1zafcAU43HEisnvQumy9cI6TjHrwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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