SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd06b14f9aaf46a1d95b195043b3fb39f1d5bac26b8291b61c8a6a0ed83067b' 
  AND token = 'wHyljjTAVnGbp/GY+gl/E6/14zyPsBNh+mBgpJiU8UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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