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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7fca0cb22dc46c15e648c5c501dfc6199ffc9aa18263f8fc54eccdc672b96c' 
  AND token = '94SoD2k9KWUbR/DaRlTEGOlXmMk+u/gwcX0V+ervMtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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