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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b6541fde7eddd9229eda7cb03543111ae02518f2af787dec7c0aeae9511820' 
  AND token = 'YmwQPFZ0hmFaigzMtdgO2sqIbT+1le8p/+pII847INo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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