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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41be97d1e38bdb6705ee0de8e88ff30863569226623f69d8b6763e82a73bbc20' 
  AND token = 'NCftUx3K+VT/9J/+eDeOVCP/Rf0l+Hn1uJKvMnwcuJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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