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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd0ee81038c69e3910ef2c20d6444035175d3677341cb1f7eaa888174ab2da6' 
  AND token = 'xAuf0L3NkWqHoZ417I+47NxMqiJ0o2cyt3MTbM4pYaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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