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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4c0b58d60ebbaf1a55416e35fa36eea38041f971e6eea73c93f607ff3a95db' 
  AND token = '9qRE52wFC1iS9XGVUkY3XjExuaHgeSKnc6d9p2jfRiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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