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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d093d8779b723742307dfc4bf93b6f3b184eb81b47073f68ab2834c6f93657c' 
  AND token = 'TXkvmelu3I0BqPQjD63DWtTnxiI7kkAhMoSdX0BGj/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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