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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b12921992901307d3ed2b2315bc74d3aa945565a405a7d68e379c85e009ecf' 
  AND token = 'wo+m03NsYj1vynmIWs36AYep8SlqHvTLZCwa5rl8WGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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