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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482b8530d9da8f628e4e7e3c3f2539aced7505455f481e988102bcca1cdd4718' 
  AND token = 'cIvKwVqlNicqYDQ6h0rZgr1W9hHjUqPqtYWSyMLaEYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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