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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985367569eb70f47f2bbba3290b71c089413fcce02c83616d75fc49f73146d8a' 
  AND token = 'rLqWMS82mpt+Y1r0FF5DIPQMtL+kC/6WGWx/+//s7+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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