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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ae37b4556405c03625fc6581dfdd39f32ef8d8b26e5850056eb328c3e20ae5' 
  AND token = 'V5BBRaikDB64PaY8HCzpxBSl/YhtJ1REtLOM/g0XAmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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