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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c08a14a2e65aba128d0477fb978de14ea9cd88ebfdeaac6d9df2ce7db19d09c' 
  AND token = 'Yshvr7WfI6Vvrg+qEZcWs8n9YJYb770lVyfCI7RGyoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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