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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae70baf0a7c338cecd55f3660906ec93667173110ae94cb8e117466b80479d2' 
  AND token = '4hk7VSutThGLss1YX3On7TxBshQ3r3/DBKvwSLwn/Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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