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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8ff1a33808ee1401a738e0fcca7602c0eef7fa55cecf02a8ef4ac74961c519' 
  AND token = 'OOSL8VL81HR/4X8rIHlMf77/+71XVLEaX14PnomZyb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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