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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe4fc8a6b0899e3ffdf45760db52b7a28299036613d7160d14b933b0a3c2768' 
  AND token = 'lOfIx2lvKgU7K8IBpHk9KccSeh47zYTb+32cb66MGLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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