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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fa82f13cef3ce528947ae1460dc60ac6404ca042fd94268354ccfb4c419ab4' 
  AND token = 'SP8sF8sFAqdP/pS7yzVmiUScJJfnv9TryTXXQ+S9GJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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