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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6bb8ca0bc7769e5cb52735d185e069a2f9f02f543598e4093a1ffd94476065' 
  AND token = 'qtLKpOiiRaPN6+O1tpfAPI4qf6l47Em+SXoh9pbiMEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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