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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf4c418a68bbde67b016c20e5177a6f9190e0ea984f0442ea32966bcf596e4f' 
  AND token = 'g3a9lPJIsxs3GOv48IeDEMKCRliMNZUz/ib39nHU5do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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