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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81809d7a71cdedf069dee30024486175c9bab268a6fea70a84a0de4a01df0242' 
  AND token = 'NGxKCrh8cV3cpD+jMr1bJGfImQx/cjvSiu4wuPFiWFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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