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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b19eea3b3f92c93fc78accbefbdb93d9bf2cd82e7e42ce4880aafa630206333' 
  AND token = 'wr493bSn2If9oyAtgS+4+S6KFe+17yu5gFIytkQtFjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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