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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883cfc719ce95811a45818aeb9b7647731962be3da29c9a3bbb912f733fcfdb2' 
  AND token = 'pZw1JERMBJDJ3R2VZlUGXN5RFCQLifuwesb27M4o6XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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