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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa61fa1039bd923dc21c538c016df958a794173bc1bfbbe0a9ca278a93f8c37' 
  AND token = 'wUnLz/0aRIqiP9NjVJU1Yo91TFTrM2KPYgIY4oniJVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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