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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1637a6c2e37a1064176fd20fc8b25e7f7e0c83f2571b906fb736436f7b7a8a85' 
  AND token = 'nOTbx9F1XPMO+F1AvJH3BwM9J9dAmCQviDOLJBBwPpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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