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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a23f3119dbd97f0ee0f2063923f607e2d9ad7fa180d12ff8cb5f41c8f66870' 
  AND token = 'ZjP+wjX+2ozPNlq3u+hZ8vTt43kGO0R+cb1dbzu370A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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