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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0620f72b8f29cbda83fc7e3bfb3b800b6e048988e88e0ffb8577f4215fbd4d4f' 
  AND token = 'fXQ2MD58wkkALJ4Dj1Ia8DNc5jTr/H3qI8/QLmIy4dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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