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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad3ff6eb01bcafe579614e61c8382184e5795531b094cee2673710773840c89' 
  AND token = 'au3zAOEE4bBdwMiSeZ0Ogys8R+0ZasBuQ9gnx6N3dgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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