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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064b5ae460e82229245f7f395ac34c6838410d4052f78bff23b8a6c730c70521' 
  AND token = 'IXz5heX9aTtcYc3Y0okC3eQ5MTaqWvYgofuSpqWMuCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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