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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f34cb24e9f8a0f50d49b888aa087ebfb1b529dac701142b0eb0f49a0edf4b7' 
  AND token = 'dWeZ+lJSN2utDxJri0LQnQTQQP1Xu7Um8F9g48xyXTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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